CVE-2026-40406

HIGH

Microsoft Windows TCP/IP - Use-After-Free Information Disclosure

Title source: manual
STIX 2.1

Description

Use after free in Windows TCP/IP allows an unauthorized attacker to disclose information over a network.

References (1)

Core 1
Core References
Vendor Advisory vendor-advisory patch
Windows TCP/IP Information Disclosure Vulnerability
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40406

Scores

CVSS v3 7.5
EPSS 0.0008
EPSS Percentile 24.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-416
Status published
Products (36)
Microsoft/Windows 10 Version 1607 10.0.14393.0 - 10.0.14393.9140
Microsoft/Windows 10 Version 1809 10.0.17763.0 - 10.0.17763.8755
Microsoft/Windows 10 Version 21H2 10.0.19044.0 - 10.0.19044.7291
Microsoft/Windows 10 Version 22H2 10.0.19045.0 - 10.0.19045.7291
Microsoft/Windows 11 version 22H3 10.0.22631.0 - 10.0.22631.7079
Microsoft/Windows 11 Version 23H2 10.0.22631.0 - 10.0.22631.7079
Microsoft/Windows 11 Version 24H2 10.0.26100.0 - 10.0.26100.8457
Microsoft/Windows 11 Version 25H2 10.0.26200.0 - 10.0.26200.8457
Microsoft/Windows 11 version 26H1 10.0.28000.0 - 10.0.28000.2113
Microsoft/Windows Server 2012 6.2.9200.0 - 6.2.9200.26079
... and 26 more
Published May 12, 2026
Tracked Since May 12, 2026